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In which we discover how our tree-clambering ancestry made us who we are

Two of far nobler shape erect and tall

Godlike erect, with native Honour clad

In naked Majestie seemd Lords of all

And worthie seemd, for in thir looks Divine

The image of thir glorious Maker shon

—John Milton, Paradise Lost

Ask anyone to think of an image that sums up the process of evolution (as I, dear reader, am now asking you), and it’s a fair bet that most will call to mind The March of Progress or one of its many successors. This picture, created by natural history artist Rudolph Zallinger in 1965 for the book Early Man by F. Clark Howell, depicts fourteen ...

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